Emulsioning walls in bed/living room

Possom

If wanting to white emulsion the walls in a small bedroom and/or living room to help make the rooms appear a little larger, I was wondering what the pros/cons are with respect to either

a) white emulsioning directly onto the plastered walls
b) covering with a plain white wall paper, and then emulsioning over this with white emulsion

If emulsioned directly onto the walls (no paper) do you think the room would be any colder due to the cold surface of the walls cooling down the room temperature? Possibly papered walls would not cool down the room temperature to the same extent...?

Thanks.

N9eav

I think paper would have a negligible effect on room temperature. If you have smooth flat plaster walls then paint on it directly. Fresh plaster (no previous coatings) thin down the paint 50/50 first coast or it will peel off.
If the walls are old like mine, I used paper as it gives a better finish.
Buy decent paint. I recently used the best quality Wilkinson paint and it was very good and well priced (They will probably have a sale on this bank holiday)